Support for installations in housing technology and industry

ABSTRACT

A support for installations in the field of housing technology and industry includes first and second chords ( 12; 62  and  16; 66 ) each formed of two parallel elongate profiles ( 13, 17; 63, 67 ) spaced by a distance (A, B; C, E) from each other and being connected by connection profiles, with a longitudinal extent of the connection profiles ( 14, 18; 64 ) intersecting a longitudinal extent of the elongate profiles ( 13, 17; 63 ) of the chords ( 12, 16; 62 ) and being greater than the distance (A, B; C) between the elongate profiles ( 13, 17; 63 ), the support further including two longitudinally extending wave-shaped bars ( 21; 71 ) for connecting the first and second chords ( 12, 16; 62, 66 ) and having turnover regions ( 22; 72, 74 ) connected with the elongate profiles ( 13, 16; 63, 67 ) of the first and second chords, respectively.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a support for installations in thefield of housing technology and industry and including first and secondchords extending parallel to each other in a spaced relationship to eachother and connectable with each other by turnover regions oflongitudinally extending, wave-shaped bars.

2. Description of the Prior Art

For flexible installation of conduits such as pipes, air ducts, cableroutes, and the like, in the field of the housing technology andindustry, often, mounting rails, which are formed of sheet metal, areused. The mounting rails have, e.g., a C-shaped cross-section, with theopen region of the mounting rail serving for securing, e.g., withso-called rail nuts, of threaded rods which support the conduits in anelevated position or which provide for suspension of the conduits.

With special connection rails, these mounting rails are assembledbeneath each other to form a flat or three-dimensional supportstructure. These mounting rails often have through-openings in theregion of their bottom for direct attachment of the mounting rail to awall or a ceiling with a dowel.

Mounting rails have proved themselves in practice. However, theirdrawback consists in that only one side of a mounting rail is accessiblefor attachment thereto. Because with a C-shaped mounting rail, an openprofile is formed, the mounting rail has a substantially worse torsionalresistance than a close profile.

Therefore, so-called double C-profile rails were provided, which wereformed of two C-shaped mounting rails riveted or welded with each other,and with which both opposite sides are were available for attachments,so that a tubular conduit could be secured above or below a doubleC-profile rail. As the C-shaped mounting rails, the double C-profilerails present, with respect to their load-bearing characteristic, acompromise between the possibilities of attachment and the strength ofthe profile. Further, double C-profile rails have a relatively large ownweight per linear meter, require a relatively large amount of materialfor the number of attachment possibilities they provide and, inaddition, are expensive in production.

British Patent No. 1,358,261 discloses a support for a concrete formworkand having a first chord and a second chord extending parallel to eachother at a distance from each other and connected with each other byturnover regions of longitudinally extending, wave-shaped bars. Thissupport has, e.g., in comparison with a C-shaped mounting rail or doubleC-profile rail a reduced own weight per linear meter.

The drawback of the support disclosed in the above-mentioned Britishpatent consists in that the support has no attachment possibilities forsuspending the support or for suspending conduits and supporting them inan elevated position.

Accordingly, an object of the present invention is to provide a supportwith a plurality of attachment possibilities and comparatively goodstatic characteristics.

SUMMARY OF THE INVENTION

This and other objects of the present invention, which will becomeapparent hereinafter, are achieved by providing a support forinstallation in a field of housing technology and industry and havingfirst and second chords each of which is formed of two parallel elongateprofiles spaced by a distance from each other. Connection profilesconnects the elongate profiles of at least one of the first and secondchords, with a longitudinal extent of the connection profilesintersecting a longitudinal extent of the elongate profiles of the atleast one of the first and second chords. The longitudinal extent of theconnection profiles is greater than the distance between the elongateprofiles of the at least one of the first and second chords. Twolongitudinally extending wave-shaped bars connect the first and secondchords. The bars have turnover regions connected with the elongateprofiles of the at least one of the first and second chords,respectively. The support has a three-dimensional lattice girderstructure with advantageous static characteristics and a relativelysmall own weight per linear meter. In addition, the opening on all sidesof the support provide numerous possibilities for attachment of threadedrods, connection elements, and the like, without a need in any speciallyformed fastening elements such as, e.g., rail nuts.

The distance between elongate profiles that form the at least one chordor also the another chord is so selected that at least one threaded rodor fastening screw can pass therebetween and be fixed on the supportwith check nuts such as, e.g., hexagon nuts. Advantageously, supportswith corresponding distances between the elongate profiles becomeavailable for conventional types of threaded rod or fastening screwsused for installations in the field of the housing technology andindustry. When a threaded rod or a fastening screw, which has smallerdimensions than the distance between the elongate profile, is used, andthe check nuts likewise have smaller dimensions than the distancebetween the elongate profiles, there can be provided a washer havingcorresponding dimensions or a stop with an opening for compensation ofthe difference in dimensions between the distance between the elongateprofiles and the dimensions of the threaded rod.

The open, accessible from all sides, lattice girder structure of thesupport enables tightening of the check nuts from all sides and withinthe support. Also, only the first chord or only the second chord can beused for attachment. For heavy conduits or for suspension of the supportfrom a ceiling, advantageously both the first and second chords areused, with the threaded rod passing through the entire support and withcheck nuts being tightened on both upper and lower sides of the support.Light conduits, e.g., for electrical cables or hoses can be easilysecured on the support with so-called cable connectors.

Further, the open, accessible from all sides, lattice girder structureof the support enables passing therethrough of installations such as,e.g., tubular conduits that can pass between the first and second chord,with the installation being secured directly beneath the ceiling, withminimum use of space. Installations such as, e.g., tubular conduits canbe supported on the support in an elevated position. The support usesthe maximum available height and insures, therefore, height attachmentpossibilities that exceed those of a C-shaped mounting rail in severaltimes at the comparative consumption of a material.

The elongate profiles form, in a plane extending transverse to theirlongitudinal extent, vertexes of a rectangle, with the support having inthis plane a V-shaped cross-section. With such a shape, the support witha larger distance between the elongate elements forms, e.g., anattachment plane for securing the support on a constructional component,e.g., on a ceiling. The opening angle of the V-shaped cross-sectionamounts advantageously to 10°-50° and is so selected that, e.g., thepipe shell can be mounted within the support.

The wave-shaped bars are welded with the elongate profiles, which formthe first and second chords, advantageously in the area of theirturnover regions. The wave-shaped bars simultaneously insure a constantdistance between the first and second chords along the entirelongitudinal extent of the support. The wave-shaped bars areadvantageously formed of a rectilinear profile bent into a wave-shapedform. Advantageously, adjacent sections of the wave-shaped bars form anangle in the range from 50° to 90°, whereby the support is provided withadvantageous static characteristics.

In addition to a continuous wave-shaped form, the bars can be formedwith a trapezoidal wave shape. In this case, the bar is bent into a formconsisting of stringed together trapezia. Advantageously, the adjacentsections of the stringed together trapezia form an angle from 15° to35°, which insures that support is provided with advantageous staticcharacteristics. Another form of the wave-shaped bar can be obtained byproviding a zig-zag-shaped bars.

According to one embodiment of the support according to the presentinvention, the wave-shaped bars are connected with the elongate profileson the inner sides of the elongate profiles, which provides for a simplemanufacturing of supports having the V-shaped cross-section. Theturnover regions of the bars are connected, preferably welded, in theregion of the elongate profiles, which are arranged next to teach other,advantageously with the elongate profiles, on one hand, and on the otherhand, with each other to provide for a desired distance between theelongate profiles.

Alternatively, the wave-shaped bars can be connected with the elongateprofiles on their outer sides, which likewise insures an easymanufacturing of the supports. In addition, with this embodiment of thesupport, the entire space defined by the plane passing through theelongate profiles and extending in a direction transverse to thelongitudinal extent of the elongate profiles, is available for securingmeans, without the wave-shaped bars narrowing this space.

The connection profiles are arranged on at least one of the chords at anangle to the longitudinal extent of the elongate profiles, so that thelongitudinal extent of the connection profiles intersects thelongitudinal extent of the elongate profiles. The connection profileshave a longitudinal extent that is greater than the distance between theelongate profiles. Thus, the connection profiles cross the elongateprofiles. Therefore, a sufficiently large contact surface between theconnection profiles and the elongate profiles is available for providinga reliable connection therebetween. The smaller is the angle formed bythe longitudinal extent of the elongate profiles and the longitudinalextent of the connection profiles, the longer the longitudinal extent ofthe connection profiles must be.

Advantageously, the connection profiles connect the elongate profiles ofone of the chord with the elongate profiles of another of the chords,which provides a stable support in which the elongate profiles of bothchords are secured by the wave-shaped bars, on one hand, and byrespective connection profiles, on the other hand.

Advantageously, the connection profiles extend perpendicular to thelongitudinal extent of the elongate profiles, whereby an adequate freespace is provided for attachment of the threaded rods, connectionelements, and the like. In addition, such a support remains stable to amost possible extent even after increasing its length to a desiredlength.

Advantageously, the elongate profiles form, in a plane extendingtransverse to their longitudinal extent, vertexes of a rectangle. Thesupport can be oriented in different directions and provides, thereby, aplurality of attachment possibilities. In this advantageous embodimentof the support, the same securing means, e.g., check nuts, can be usedwith the first chord and the second chord for securing a threaded rod ora fastening screw passing or extending through the support. The support,in addition to a rectangular cross-section having different transversedimensions such as, e.g., a width different from the height, can have asquare cross-section.

With simple connection means, e.g., a combination of angles andfastening screws, several supports having a rectangular cross-sectioncan be easily connected to form a flat or three-dimensional supportconstruction. The connection means can include, as a connection element,e.g., an L-shaped angle with legs extending at an angle to each other,or an angle with multiple bends, with more than two legs.Advantageously, all legs of the angle are provided with through-openingsfor fastening screws.

It is particularly advantageous when the openings are formed asrectangular openings in which, e.g., a truss-head screw with arectangular headpiece can be secured against rotation, providing for asimple mounting of connection means.

Advantageously, the connection profiles are secured on respectiveadjacent sides of respective elongate profiles forming respective firstand second chords. Thereby, a receiving space, e.g., for a guide sectionof an attachment element, is provided between the elongate profilesforming the first chord and/or elongate profiles forming the secondchord. As a connection element for connecting two supports, e.g., aL-shaped angle provided with beads, can be used, with the bead bottompenetrating into the receiving space upon mounting of the L-shaped angleon the support. The beads in the angle serve, on one hand, as guidemeans and as rotation-preventing means and, on the other hand, the beadsimprove the strength characteristics of the angle. The receiving spacecan simultaneously serve for receiving the rectangular headpiece of atruss-head screw. Thereby, the truss-head screw is retained againstrotation upon being tightened.

Advantageously, the wave-shaped profile of the bars undulates in adirection transverse to the longitudinal extent of the elongate profilesso that a plurality of attachment possibilities is provided on supportsides between the first and second cords. This arrangement of thewave-shaped bars is particularly advantageous when an installation,e.g., a tubular conduit must be extended between the first and secondchords.

Advantageously, the wave-shaped bars form attachment regions for thesupport which are formed by turnover regions extending beyond theelongate profiles and parallel to a plane passing through elongateprofiles of one of the chords. With wave-shaped bars which are securedto the elongate profiles at their inner sides, the turnover regions arebent outwardly and form a through-opening for a fastening element forsecuring the support on a constructional component. For securing thesupport, a dowel with a washer is used as a fastening element. Thedowel, upon tightening, on one hand, engages the wave-shaped bar in thearea of attachment regions and, on the other hand, engages elongateprofiles, whereby the welding spots between the wave-shaped bar and thecorresponding elongate profile are relieved. With the wave-shaped barswhich are secured on the outer side of the elongate profiles, theturnover regions are bent inwardly and form a through-opening for afastening element for securing the support on a constructionalcomponent. With wave-shaped bars formed by stringed together trapezia,the turnover regions thereof, which extend along the longitudinal extentof the corresponding elongate profiles, can form an attachment regionfor the support, providing fixing eyelets in form of elongate openings,which noticeably improves the flexibility of fastening possibilities.Advantageously, at least one of the elongate profiles has a circularcross-section. Most advantageously, all of the elongate profiles have acircular cross-section. Such a support can be easily produced in aplurality of shapes to be able to cover a large field of staticrequirements the support needs to meet.

Advantageously, at least one of the connection profiles and/or at leastone of the wave-shaped bars has a circular cross-section. Mostadvantageously, all of the connection profiles and/or wave-shaped stabshave a circular cross-section. Such a support can be easily produced ina plurality of shapes to cover a large field of static requirements thesupport needs to meet.

According to an advantageous embodiment of the invention, the elongateprofiles, the connection profiles, and the wave-shaped bars all have acircular cross-section. Alternatively, separate profiles can have anon-circular cross-section, whereby, e.g., a combination of elongateprofiles with polygonal, e.g., rectangular, cross-section and with acircular cross-section can be used for forming the first chord and/orthe second chord.

Advantageously, the ratio of cross-sectional dimensions of elongateprofiles to cross-sectional dimensions of the wave-shaped bars lies in arange from 1.1:1 to 3:1, which provides for a support with advantageousstatic characteristics at a low own weight per linear meter.

Advantageously, the ratio of cross-sectional dimensions of elongateprofiles to cross-sectional dimensions of the connection profiles liesin a range from 1:1.1 to 1:3 which provides for a support withadvantageous static characteristics at a low own weight per linearmeter.

The elongate profiles, connection profiles, and/or wave-shaped bars areadvantageously formed of wire. For a simple manufacturing of supports,advantageously, wires with the same cross-sectional dimensions and/orwith the same cross-sectional shape are used for the wave-shaped barsand the connection profiles.

Instead of welding connections, the elongate profiles, connectionprofiles, and the wave-shaped bars can be soldered with each other orglued with each other.

As the material for the profiles or the wire advantageously, metal isused. Dependent on the field of use, a stainless steel or aluminum canbe used. Alternatively, the profiles and wire can be formed of plasticsor a carbon fiber-reinforced plastics for producing supports.

The novel features of the present invention, which are considered ascharacteristic for the invention, are set forth in the appended claims.The invention itself, however, both as to its construction and its modeof operation, together with additional advantages and objects thereof,will be best understood from the following detailed description of thepreferred embodiments, when read with reference to the accompanyingdrawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings show:

FIG. 1 a side view of a first embodiment of a support according to thepresent invention;

FIG. 2 a cross-sectional view along line II-II in FIG. 1;

FIG. 3 a side view of FIG. 1 with attachment components;

FIG. 4 a cross-sectional view along line IV-IV in FIG. 3;

FIG. 5 a cross-sectional view along line V-V in FIG. 3;

FIG. 6 a side view of a connection point of two supports according tothe present invention;

FIG. 7 a cross-sectional view along line VII-VII in FIG. 6;

FIG. 8 a side view of a second embodiment of a support according to thepresent invention;

FIG. 9 a cross-sectional view along view IX-IX in FIG. 8; and

FIG. 10 a view along line X-X in FIG. 9.

Basically, the same elements in the drawings are designated with thesame reference numerals.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

A support 11 for installations in the field of housing technology andindustry, which is shown in FIGS. 1-2 and represent a first embodimentof the present invention, includes a first support chord 12 and a secondsupport chord 16 spaced from the first support cord 12 and extendingparallel thereto. The first and second chords 12, 16 are connected witheach other by two, wave-shaped along their longitudinal extent, bars 21which are connected with the first and second chords 12, 16 at theirturnover regions 22. The adjacent sections 23 of the wave-shaped bars 21form with each other an angle W of about 70°.

The first chord 12 is formed of two, extending parallel to each otherand spaced from each other by a distance A, elongate profiles 13 whichare connected with each other by connection profiles 14, with thelongitudinal extent of the connection profiles 14 being transverse tothe longitudinal extent of the elongate profiles 13. The longitudinalextent of a connection profile 14 is greater than the distance A betweenthe elongate profiles 13. Both the elongate profiles 13 and theconnection profiles 14 are formed of a wire having a circularcross-section. The longitudinal extent of the connection profile 14 isgreater than the distance A between the elongate profiles 13 by about adouble of a diameter D of the elongate profile 13. The wave-shaped bars21 are also formed of a wire having a circular cross-section.

The second chord 16 is formed of two elongate profiles 17 extendingparallel to each other and spaced from each other by a distance B. Theelongate profiles 17 are connected with each other by connectionprofiles 18 extending transverse to the longitudinal extent of theelongate profiles 17. The connection profiles 18 have a longitudinalextent which is greater than the distance B between the two elongateprofiles, and are formed of a wire having a circular cross-section. Thelongitudinal extent of the connection profiles 18 is greater than thedistance B between the elongate profiles 17 by about a double of thediameter D of the elongate profiles 17.

The elongate profiles 13 and 17 form, in a plane extending transverse totheir longitudinal extent, vertexes of a rectangle (see FIG. 2). In theembodiment shown in FIGS. 1-2, the distance A between the elongateprofiles 13 and the distance B between the elongate profiles 17 areequal to each other. The wave-shaped profile of the bars 21 undulates ina direction transverse to the longitudinal extent of elongate profiles13 and 17, and the bars are connected with elongate profiles 13 and 17on the outside thereof.

The connection profiles 14 of the first chord 12 are fixedly secured onthe side of the elongate profiles 13, which form the first chord 12,adjacent to the elongate profiles 17 of the second chord 16, by weldingto provide a receiving space 15. The connection profiles 18 of thesecond chord 16 are fixedly secured on a side of the elongate profiles17, which form the second chord 16, adjacent to the elongate profiles 13of the first chord 12, by welding to provide a receiving space 19.

Each respective connection profile 14 or 18 is connected by weldingpoints with the elongate profiles 13 which form the first chord 12, andwith the elongate profiles 17 which form the second chord 16, at eachconnection region of the turnover regions 22 of the wave-shaped bars 21.Additional connection profiles 14 and 18 are provided, respectively, onthe elongate profiles 13, which form the first chord 12, and elongateprofiles 17, which form the second chord 16, between the turnoverregions 22 of the wave-shaped bars 21.

The ratio of the diameter D of the elongate profiles 13 or 17 to thediameter S of the wave-shaped bars 1 amounts to 2:1. The ratio of thediameter D of the elongate profiles 13 or 17 to the diameter V of theconnection profiles 14 or 18 amounts also to 2:1 in the embodiment shownin FIGS. 1-2.

Below, with reference to FIGS. 3-5, two examples of possible connectionswith the support 11 will be described.

For suspension 30 of the support 11 from a ceiling (not shown), athreaded rod 31 with a M 10 thread is secured on a ceiling with a dowel,is passed between the elongate profiles 13 and 17, which form,respectively, the chords 12 and 16, and is secured with two check nuts32 and 33. With the check nuts 32 and 33, the suspension height of thesupport 11 can be easily adjusted.

For suspension 36 of a tubular conduit (not shown) on a support 11, athreaded rod 37 with a thread M 10 is passed between elongate profiles17, which form the second chord 16, and is secured with two check nuts38, 39. With an open, accessible from all sides, lattice girderstructure of the support 11, the check nut 39 can be easily securedinside the support 11 with a wrench. With the check nuts 38, 39 thesuspension height of the tubular conduit can be easily adjusted.

FIGS. 6-7 illustrate a connection junction for connecting a horizontallyextending support 11 with a vertically extending support 41. The support41 is formed in the same way as the support 11. With two L-shaped angles51 and three truss-head screws 56 with a rectangular headpiece 58 and onwhich, respectively, a hexagon nut is screwed as a check nut 57, thesupport 11 is secured on the support 41.

Each angle 51 has two, arranged perpendicular to each other legs 52,with each leg 52 having a bead 54 and a rectangular opening 53. The bead54 is so formed that upon placing the angle 51 on the support 11 or 41,it is located in the receiving space between elongate profiles whichform the first chord or the second chord. The rectangular headpiece 58on the truss-head screw 56 is so selected that it can pass through orextend into the receiving space between the elongate profiles. Thetruss-head screw 56, e.g., is passed first through the angle 52 and thenthrough the support 11 or 41, with the headpiece 58 of the truss-headscrew 56 engaging in the rectangular opening 53, which insures that thetruss-head screw 56 would not rotate. Alternatively, the truss-headscrew 56 is first passed through the support 11 or 41 and finallythrough the angle 52, with the rectangular headpiece 58 of thetruss-head screw 56 being located between the elongate profiles of thesupport 11 or 41, which likewise insures that the truss-head screw 56would not rotate.

FIGS. 8-10 show a second embodiment of a support 61 according to thepresent invention and having a first chord 62 and a second cord 66extending parallel to the first chord 62 and spaced therefrom. The firstand second chords 62, 66 are connected with each other by two,wave-shaped along their longitudinal extent, bars 71 which are connectedwith the first and second chords 62, 66 at their turnover regions 72 and74. The first chord 62 is formed of two, extending parallel to eachother and spaced from each other by a distance C, elongate profiles 63which are connected with each other, by connection profiles 64, with thelongitudinal extent of the connection profiles 64 being transverse tothe longitudinal extent of the elongate profiles 63. The longitudinalextent of the connection profiles 64 and the longitudinal extent of theelongate profiles 63 form with each other an angle N of less than 90°.The longitudinal extent of the connection profiles 64 is so selectedthat they can be welded with the elongate profiles 63. The second chord66 is formed of two elongate profiles 67 extending parallel to eachother and spaced from each other by a distance E. The support 61 has, ina plane extending transverse to the longitudinal extent of the elongateprofiles 63 and 67, a V-shaped cross-section. The wave-shaped bars 71form in this cross-section an angle F of 40°.

The wave-shaped bars 71 are formed of a wire having a circularcross-section and have, in a side view, a plurality of following eachother trapezia. An angle G between two adjacent sections 73 of thewave-shaped bar 71 amounts to 15°.

The wave-shaped bars 71 extend in a direction transverse to thedirection of the longitudinal extent of the elongate profiles 65 or 67and are welded to the adjacent sides of the elongate profiles 63 or ofthe elongate profiles 67, respectively. In the turnover region 74, thewell-shaped bars 71 are additionally welded with each other and providethe desired distance E between the elongate profiles 67 of the secondchord 66.

The wave-shaped bars 71 form further connection regions 76 for the firstchord 61, with the connection regions 76 being formed by turnoverregions 74 which extend outwardly beyond the elongate profiles 63. Theconnections regions 76 extend parallel to a plane passing through theelongate profiles 63 of the chord 62. The connection regions 76 formelongate openings through which fastening elements can be extended. Thewave-shaped bars 71 abut the elongate profiles 63 and are connectedtherewith in respective tangent regions 75.

The elongate profiles 63 and 67 and the connection profiles 64 have acircular cross-section. The ratio of the diameter K of the elongateprofiles 63 and 67 to the diameter L of the wave-shaped bar 71 amountsto 1.5:1. The ratio of the diameter K of the elongate profiles 63 and 67to the diameter M of the connection profiles 64 amounts in theembodiment shown in FIGS. 8-10, to 2:1.

The distance H between the first chord 62 and the second chord 66 is soselected that an installation can pass therebetween. FIG. 8 shows, withdot-dash lines, a pipe shell 81 secured on the second chord 66 forsupporting of a conduit extending therethrough. The distance E betweenthe elongate profiles 66 of the second chord 66 is so selected that athreaded rod can pass therethrough and be secured to the second chord 66with a check nut.

Though the present invention was shown and described with references tothe preferred embodiments, such is merely illustrative of the presentinvention and is not to be construed as a limitation thereof and variousmodifications of the present invention will be apparent to those skilledin the art. It is therefore not intended that the present invention belimited to the disclosed embodiments or details thereof, and the presentinvention includes all variations and/or alternative embodiments withinthe spirit and scope of the present invention as defined by the appendedclaims.

1. A support for installations in a field of housing technology andindustry, comprising first and second chords (12; 62 and 61; 66) eachformed of two parallel elongate profiles (13, 17; 63, 67) spaced by adistance (A, B; C, E) from each other; connection profiles (14, 18; 64)for connecting the elongate profiles (13, 17; 63) of at least one of thefirst and second chords (12, 16; 62), with a longitudinal extent of theconnection profiles (14, 18; 64) intersecting a longitudinal extent ofthe elongate profiles (13, 17; 63) of the at least one of the first andsecond chords (12, 16; 62) and being greater than the distance (A, B; C)between the elongate profiles (13, 17; 63) of the at least one of thefirst and second chords (12, 16; 62); and two longitudinally extendingwave-shaped bars (12; 71) for connecting the first and second chords(12, 16; 62, 66) and having turnover regions (22; 72, 74) connected withthe elongate profiles (13, 16; 63, 67) of the first and second chords,respectively.
 2. A support according to claim 1, wherein the elongateprofiles (13) of the at least one of the first and second chord (12) andthe elongate profiles (17) of another of the first and second chords(17) are connected with each other by respective connection profiles(14, 18).
 3. A support according to claim 1, wherein the connectionprofiles (14, 18) extend perpendicular to the longitudinal extent of theelongate profiles (13, 17) of the at least one of the first and secondchords (12, 16).
 4. A support according to claim 1, wherein the elongateprofiles (13, 17) form, in a plane extending transverse to thelongitudinal extent of the elongate profiles (13, 17), vertexes of arectangle.
 5. A support according to claim 2, wherein the connectionprofiles (14, 18) are secured to respective, adjacent to each other,sides of the elongate profiles (13) of the first chord (12) and theelongate profile (17) of the second chord (16).
 6. A support accordingto claim 1, wherein a respective connection profile (14, 18) isconnected fixedly with the elongate profiles (13, 17) forming the atleast one of the first and second chords (12, 16) at each connectionregion of the turnover regions (22) of the wave-shaped bars (21).
 7. Asupport according to claim 1, wherein the wave-shaped profile of thebars (12; 71) undulates in a direction transverse to the longitudinalextent of the elongate profiles (13, 17; 63, 67).
 8. A support accordingto claim 1, wherein the wave-shaped bars (71) form connection regions(76) for the support (61), with the connection regions (76) being formedby the turnover regions (72) extending beyond the elongate profiles (63)parallel to a plane passing through the elongate profiles (63) of thechords (62).
 9. A support according to claim 1, wherein at least one ofthe elongate profiles (13, 17; 63, 67), the connection profiles (14, 18;64), and the wave-shaped bars (21; 71) have a circular cross-section.10. A support according to claim 1, wherein a ratio of cross-sectionaldimensions (D) of the elongate profiles (13, 17; 63, 67) to across-sectional dimension (S) of the wave-shaped bars (21; 71) lies in arange from 1.1:1 to 3:1.
 11. A support according to claim 1, wherein aratio of cross-sectional dimensions (D) of the elongate profiles (13,17; 63, 67) to cross-sectional dimensions (V) of the connection profiles(14, 18; 64) lies in a range from 1:1.1 to 1:3.